Internet Mail Service-->Routing-->Routing restrictions-->Host and clients<br>
that successfully authenticate<br>
<br>
更多请参考<br>
<a target=_blank href=http://support.microsoft.com/default.aspx?scid=kb%3ben-us%3b199656>http://support.microsoft.com/default.aspx?scid=kb%3ben-us%3b199656</a><br>